Infrastructure Error

Suresh Kandoth explains the various causes of “Login-based server access validation failed with an infrastructure error” error messages:

The important piece of information from that message is the part about server access validation failed. So let’s examine that carefully. During the login process, the database engine has to perform several checks regarding the login and its various attributes before letting the application connect to the SQL Server instance. Out of that big list, related to this error condition, there are two checks to find out if this login is authorized to access this server instance. There are two permissions that come into play while performing these authorization checks:

– Does the login have the SERVER class permission named CONNECT SQL for this server instance?

– Does the login have the ENDPOINT class permission named CONNECT for the specific endpoint on which the client application established the connection?

Suresh lays out a number of scenarios and explains why they could cause this error to occur.

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